George richabdson



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TO ALL WHOM IT MAY CONCERN:

Be it known that I, GEORGE RICHARDSON, of Lowell, county of Middlesex, and State'of Massachusetts, have invented new and useful Improvements in Let-Ofi` Motion for Looms; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and letters of reference marked thereon. i

The nature of my invention consists in providing a more perfect, simple, and positive letoff motion for a loom, as hereinafter set forth. j n

To enable others skilled inthe art to make and use my invention, I will proceed to describe its construction and operation.

Figure 1 represents a side elevation of a loom with my improvements attached.

a represents the loom-side; b b, the warp-shades; c, the warp; d, the whip-roll; e, the whip-roll finger; f, the tensionrod; g, the adjustable finger; i., the cam t' and j, the stands for supporting and guiding the tensionrod f; 7c, the tension-spring; Z, the adjustable collar; m and p, the stands for attaching the ends of strap; n', the friction-band or strap; o, the grooved friction-wheel; g, the pinion-gear, and r the yarnfbeam gear.

To manufacture perfect even cloth the motive power or impulse which acts upon the let-off should emanate from, and be caused by, the mild and natural tension of the warp, `which has been shortened between the whiproll and cloth by the last thread thrown in 'and crossing of` the sheds, and not by the positive and arbitrary stroke of the lathe, which, striking against the cloth, produces concussion and unnatural strain to the web, which Would be disastrousand fatal to the object desired. Ordinarily and usually let-oil's in looms occur imperfectly and unevenly, which is generally caused by the motive power being taken from the abrupt and arbitrary stroke of the lathe instead of the natural and easy tension ofthe warp.

The operation of my invention is as follows: The tension or the motive power from the warp c, when thc shades or sheds I; b at their angles in the harness are farthest apart, acts upon the whip-roll al, which instantly imparts corresponding motion to the Whip-roll finger e, which then instantly acts upon the tension-mdf, forcing it through the stands z' and To this' rodf isattached the stand m, the strap or band n being fastened at one end to the stand p, and then passed around and over the grooved pulley o. Its other end is secured to the stand m. Thus it will be seen that, when motion is imparted to the tension-rod f, itl instantly relieves thc strain of the band n on-the grooved pulley o suiciently for the required strain in the warp c, as this imparts Amotion to the pinion-gear q and yarn-.beam gear r, thus giving motion to the yarn-beam suicient to .compensate and equalize the strain on the whip-roll d, which is caused by each subsequent and successive thread of Woof woven in and crossing of Warp. The strain and friction of the band or strap n., acting upon the periphery of the grooved wheel o, is increased or diminished by the adjustable collar Z acting against the tensionspring 7c at the will of the operator. The cam h, acting against the adjustable finger g simultaneously with the stroke of the sley against the cloth, causes a positive stop motion to the let-offvat the required instant.

What I claim as my invention, and desire to secure by Letters Patent, is

The combination of the whip-roll ngei' e, tension-rod f, tension-spring v7c, grooved or equivalent-shaped Wheel o, and strap or band 11, arranged and operating together substantially as and for the purpose herein specified.

I also claim the combination of the cam 7L, adjustable finger y, rod f, and strap n, for producing apositive stop to the let-01T motion while beating up the Woof, substantially as herein specified.

GEORGE RICHARDSON.'

Witnesses:

Amat Pnvnr, G. E. PEvEY. 

